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30 lines
1.3 KiB
Markdown
30 lines
1.3 KiB
Markdown
# Media Repository
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*Synapse implementation-specific details for the media repository*
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The media repository is where attachments and avatar photos are stored.
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It stores attachment content and thumbnails for media uploaded by local users.
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It caches attachment content and thumbnails for media uploaded by remote users.
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## Storage
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Each item of media is assigned a `media_id` when it is uploaded.
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The `media_id` is a randomly chosen, URL safe 24 character string.
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Metadata such as the MIME type, upload time and length are stored in the
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sqlite3 database indexed by `media_id`.
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Content is stored on the filesystem under a `"local_content"` directory.
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Thumbnails are stored under a `"local_thumbnails"` directory.
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The item with `media_id` `"aabbccccccccdddddddddddd"` is stored under
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`"local_content/aa/bb/ccccccccdddddddddddd"`. Its thumbnail with width
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`128` and height `96` and type `"image/jpeg"` is stored under
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`"local_thumbnails/aa/bb/ccccccccdddddddddddd/128-96-image-jpeg"`
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Remote content is cached under `"remote_content"` directory. Each item of
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remote content is assigned a local `"filesystem_id"` to ensure that the
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directory structure `"remote_content/server_name/aa/bb/ccccccccdddddddddddd"`
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is appropriate. Thumbnails for remote content are stored under
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`"remote_thumbnail/server_name/..."`
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